Loss of appetite can happen for many reasons, such as stress, anxiety, poor sleep, indigestion, infections, certain medicines, vitamin deficiencies, or underlying medical conditions. Before taking any medicine to increase hunger, it is important to identify the cause. In many cases, appetite improves by eating small, frequent meals, staying well hydrated, getting adequate sleep, engaging in light physical activity, and choosing nutritious foods that are appealing to you. Some appetite-stimulating medicines are available, but they should only be taken after a doctor's evaluation because they may have side effects and may not be appropriate for all age groups or medical conditions. If your loss of appetite has lasted for more than a few weeks, is associated with weight loss, weakness, nausea, vomiting, fever, abdominal pain, or any other concerning symptoms, you should consult a doctor for a proper assessment and treatment. In the meantime, try eating smaller portions more often throughout the day, include protein-rich foods, avoid skipping meals, and manage stress if it is contributing to the problem. A healthcare professional can determine whether you need nutritional supplements, treatment for an underlying condition, or a specific medicine to help improve your appetite.